VNTR Chimerism Study [POST-BMT] Test: Booking, Price, and Results
About VNTR Chimerism Study [POST-BMT] Test: Booking, Price, and Results
| Field | Value |
|---|---|
| Also Known As | Chimerism Analysis, Engraftment Monitoring, Post-Transplant Chimerism Study, VNTR PCR Chimerism |
| Sample Type | Peripheral blood (EDTA tube) |
| Fasting Required | No fasting required |
| Report Time | 5 days |
| Recommended For | All ages and genders; patients who have undergone allogeneic bone marrow transplant (BMT) or haematopoietic stem cell transplant (HSCT) |
| Price | Starting at ₹7,200 |
What is a VNTR Chimerism Study [POST-BMT] Test?
The VNTR Chimerism Study [POST-BMT] test is a specialised molecular test performed after a bone marrow or stem cell transplant. It determines whether the blood-forming cells in the recipient's body are of donor origin, recipient origin, or a mix of both. Also known as Chimerism Analysis or Engraftment Monitoring, this test uses a small sample of peripheral blood collected in an EDTA tube. It is typically ordered by a transplant physician as part of routine post-transplant care.
What Does a VNTR Chimerism Study [POST-BMT] Test Measure?
This test analyses specific regions of DNA called VNTR loci (Variable Number Tandem Repeats). These are unique genetic markers that differ between individuals and are used to tell donor and recipient DNA apart. The following parameters are examined:
| Parameter | What It Indicates |
|---|---|
| Complete chimerism | Only donor blood-forming cells are detected (more than 95% donor cells) |
| Mixed chimerism | Both donor and recipient blood-forming cells are present |
| Donor chimerism percentage | The proportion of donor cells, used to track transplant success over time |
| Split chimerism | One cell type (e.g. T cells) is of recipient origin while others are donor-derived |
| VNTR loci markers | Genetic fingerprints used to distinguish donor DNA from recipient DNA |
Why is a VNTR Chimerism Study [POST-BMT] Test Done?
This test is not usually triggered by symptoms. Instead, it is ordered as part of a structured monitoring programme after a transplant. Below are the clinical reasons it may be requested.
Common Symptoms That May Require This Test
Chimerism changes are often asymptomatic, meaning no obvious symptoms are felt. The test is generally ordered as scheduled monitoring or when there is clinical concern. Situations that may prompt testing include:
- Unexplained drop in blood counts after transplant
- Signs of possible graft failure such as persistent anaemia or low white blood cell counts
- Fever or recurring infections suggesting poor immune recovery
- Clinical suspicion of disease relapse in patients transplanted for blood cancers
- Fatigue or weakness that does not improve as expected after transplant
- Clinical signs consistent with graft-versus-host disease (GVHD)
Conditions This Test Can Help Detect
The VNTR Chimerism Study [POST-BMT] test supports the detection and monitoring of several conditions. These include:
- Graft rejection or graft failure following allogeneic transplant
- Early relapse of blood cancers such as leukaemia or lymphoma
- Graft-versus-host disease (GVHD), a condition where donor cells attack the recipient's tissues
- Incomplete engraftment in patients transplanted for non-malignant conditions such as thalassaemia, sickle cell disease, severe aplastic anaemia, and immunodeficiency disorders
VNTR Chimerism Study [POST-BMT] Test for Chronic Disease Monitoring
Chimerism monitoring is a standard part of the long-term care plan for all patients who have received an allogeneic stem cell transplant. Testing is typically scheduled at day 30, day 90, day 180, and one year after the transplant, with ongoing monitoring beyond that. Serial results over time are far more informative than a single result, as they track whether donor cell levels are stable, rising, or declining.
How to Prepare and What to Expect
No special preparation is needed for this test. The steps below outline what you can expect before and during sample collection.
Do You Need to Fast?
No fasting is required before the VNTR Chimerism Study [POST-BMT] test. You may eat and drink normally on the day of your appointment.
Practical Tips Before Your Test
A few simple steps will help ensure the sample is collected and processed correctly:
- Bring a detailed clinical history, including your symptoms, previous test results, and transplant details, as this is required for the test.
- Inform the collection staff about any immunosuppressive medications you are currently taking.
- Ensure the sample reaches the laboratory within 72 hours of collection, as delays can affect certain cell separation procedures.
- Stay well hydrated before the appointment to make the blood draw easier.
- Wear a loose-fitting top or clothing with sleeves that can be rolled up easily.
Step-by-Step Procedure
Here is what typically happens during a VNTR Chimerism Study [POST-BMT] test appointment:
- A trained phlebotomist (blood collection specialist) cleans the inside of your elbow with an antiseptic wipe.
- A small amount (2 mL) of peripheral blood is drawn into a lavender-top EDTA tube.
- The sample is labelled and stored at 2 to 8 degrees Celsius before dispatch to the laboratory.
- In the laboratory, DNA is extracted from the blood cells.
- End-point PCR (polymerase chain reaction) is used to amplify VNTR loci, specific regions of DNA that vary between individuals.
- The amplified DNA fragments from the recipient's sample are compared with the donor's baseline sample to calculate the percentage of donor versus recipient cells.
Factors That Can Affect Accuracy
Several factors can influence how reliable the result is:
- Low white blood cell counts in early post-transplant patients may affect the quality of the sample
- Insufficient sample volume or poor sample handling during transport
- Absence of a pre-transplant baseline sample from the donor or recipient
- Use of non-myeloablative conditioning (a gentler transplant preparation regimen), which can prolong mixed chimerism
- In some donor-recipient pairs, available VNTR markers may not be sufficiently distinct to give a clear result
Understanding Your VNTR Chimerism Study [POST-BMT] Test Results
Results from this test are best reviewed in sequence over time rather than as a single reading. Your transplant doctor will compare each result with previous values to understand the direction of change. The table below provides general reference categories:
| Result Category | Donor Cell Percentage | General Interpretation |
|---|---|---|
| Complete chimerism | More than 95% donor cells | Indicates successful engraftment |
| Mixed chimerism | Greater than 0% but less than 95% donor cells | Both donor and recipient cells present |
| Autologous recovery | 0% donor cells | May indicate graft rejection or failure |
Disclaimer: These ranges are general guidelines. Your doctor will interpret your results based on your age, health history, and other factors. Always consult a qualified healthcare professional for personalised medical advice.
Results During Special Conditions
Certain circumstances can influence how results are interpreted:
- Patients who received non-myeloablative conditioning may show prolonged mixed chimerism, which in this case is not a sign of graft failure.
- In patients transplanted for non-malignant conditions, stable mixed chimerism is often acceptable, but in blood cancer patients, rising recipient chimerism may signal relapse.
- Patients who received T cell-depleted bone marrow grafts commonly show mixed chimerism in the early post-transplant period.
How to Maintain Healthy Levels
While chimerism levels are determined by transplant biology and cannot be directly controlled through lifestyle, there are practical steps that support post-transplant recovery:
- Attend every scheduled follow-up appointment and chimerism test as advised by your transplant team.
- Report any new symptoms, such as fever, unusual tiredness, or signs of infection, to your doctor promptly.
- Take all immunosuppression medications exactly as prescribed, and do not stop or adjust them without medical guidance.
Lupin Diagnostics VNTR Chimerism Study [POST-BMT] Test Price and Home Collection
The VNTR Chimerism Study [POST-BMT] test is available at Lupin Diagnostics starting at ₹7,200, with home sample collection offered for eligible patients.
| City | Approximate Price (₹) |
|---|---|
| BHOPAL | 7200 |
| CHENNAI | 7200 |
| HYDERABAD | 7200 |
| KOLKATA | 7200 |
| NAVI MUMBAI | 7200 |
| PUNE | 7200 |
Disclaimer: Prices are indicative and may vary by location. Please confirm the current price at the time of booking.
How to Book
- Select the VNTR Chimerism Study [POST-BMT] test on the Lupin Diagnostics website.
- Choose your city and preferred time slot.
- Opt for home sample collection by a certified phlebotomist, or visit your nearest Lupin Diagnostics centre.
- Receive your report via email or WhatsApp within the stipulated turnaround time.
Home Collection
Home collection for the VNTR Chimerism Study [POST-BMT] test is available across multiple cities through trained phlebotomists. All samples are processed in NABL-accredited laboratories to ensure accuracy and reliability. Digital reports are delivered within 5 days of sample collection.
Frequently Asked Questions
A VNTR Chimerism Study [POST-BMT] test checks whether blood-forming cells in a transplant recipient are of donor or recipient origin. It uses unique DNA markers called Variable Number Tandem Repeats (VNTR) to tell the two apart. This helps doctors confirm whether the transplant has taken hold successfully.
After an allogeneic bone marrow transplant, the goal is for donor cells to take over blood production in the recipient. This test lets the transplant team confirm engraftment, detect early signs of graft rejection, and identify possible disease relapse in patients treated for blood cancers.
Chimerism testing is typically scheduled at day 30, day 90, day 180, and one year after transplant. Your transplant doctor may order additional tests depending on your results and clinical condition. The trend across multiple time points is more informative than any single result.
Complete donor chimerism means that more than 95% of your blood-forming cells are of donor origin. This is the desired outcome after an allogeneic transplant and indicates that the graft has successfully replaced the recipient's original blood cell production.
Not necessarily. In patients transplanted for non-malignant conditions such as thalassaemia or aplastic anaemia, stable mixed chimerism may be acceptable. However, in patients treated for blood cancers, rising recipient cell levels can signal disease relapse. Your doctor will assess what the result means for your specific situation.
Results for the VNTR Chimerism Study [POST-BMT] test are typically available within 5 days of sample collection at Lupin Diagnostics. Timing may vary slightly depending on sample quality and laboratory scheduling.
VNTR Chimerism Study [POST-BMT] Test: Booking, Price, and Results
